Fix NullPointerException when checking for existence of projects without version - port upstream fix

[VithikaS]

Description

Port NPE fix when project does not have version

Addressed Issue

Ports DependencyTrack/dependency-track#2966 and DependencyTrack/dependency-track#3068

Additional Details

Checklist

• I have read and understand the contributing guidelines
• This PR fixes a defect, and I have provided tests to verify that the fix is effective
• This PR implements an enhancement, and I have provided tests to verify that it works as intended
• This PR introduces changes to the database model, and I have added corresponding update logic
• This PR introduces new or alters existing behavior, and I have updated the documentation accordingly

[nscuro]

The original PR fixed a regression introduced in an earlier "fix": DependencyTrack/dependency-track#2966

The doesProjectExist method was added there: https://github.com/DependencyTrack/dependency-track/pull/2966/files#diff-75cd29a0a085d84dff3cb4794242e0d1b400385f1acfae172346c3e6780629b0R1143-R1165

But damn, great you found another problematic area! :D

[VithikaS]

The original PR fixed a regression introduced in an earlier "fix": DependencyTrack/dependency-track#2966

The doesProjectExist method was added there: https://github.com/DependencyTrack/dependency-track/pull/2966/files#diff-75cd29a0a085d84dff3cb4794242e0d1b400385f1acfae172346c3e6780629b0R1143-R1165

But damn, great you found another problematic area! :D

Oh no.. what did i do.. damn.. i will add the original "fix"

[VithikaS]

The original PR fixed a regression introduced in an earlier "fix": DependencyTrack/dependency-track#2966
The doesProjectExist method was added there: https://github.com/DependencyTrack/dependency-track/pull/2966/files#diff-75cd29a0a085d84dff3cb4794242e0d1b400385f1acfae172346c3e6780629b0R1143-R1165
But damn, great you found another problematic area! :D

Oh no.. what did i do.. damn.. i will add the original "fix"

Added original fix with null version check. Ready for review now